"Hobart ratcheting style headgear provides a precise fit in Hobart standard welding helmets Item#s 1640805 and 1648512, as well as the Hobart clear faceshield Item# 1640860, all sold separately. Will also replace the headgear in many other standard welding helmets from Hobart and other popular brands. Adjustable Fit Yes, Product Type Helmet accessory. Ratcheting action delivers a precise, comfortable fit"